%%%----------------------------------------------------------------------
%%% File    : node_pep_sql.erl
%%% Author  : Christophe Romain <christophe.romain@process-one.net>
%%% Purpose : Standard PubSub PEP plugin with ODBC backend
%%% Created :  1 Dec 2007 by Christophe Romain <christophe.romain@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2020   ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------

%%% @doc The module <strong>{@module}</strong> is the pep PubSub plugin.
%%% <p>PubSub plugin nodes are using the {@link gen_pubsub_node} behaviour.</p>

-module(node_pep_sql).
-behaviour(gen_pubsub_node).
-author('christophe.romain@process-one.net').


-include("pubsub.hrl").
-include("ejabberd_sql_pt.hrl").

-export([init/3, terminate/2, options/0, features/0,
    create_node_permission/6, create_node/2, delete_node/1,
    purge_node/2, subscribe_node/8, unsubscribe_node/4,
    publish_item/7, delete_item/4, remove_extra_items/3,
    get_entity_affiliations/2, get_node_affiliations/1,
    get_affiliation/2, set_affiliation/3,
    get_entity_subscriptions/2, get_node_subscriptions/1,
    get_subscriptions/2, set_subscriptions/4,
    get_pending_nodes/2, get_states/1, get_state/2,
    set_state/1, get_items/7, get_items/3, get_item/7,
    get_item/2, set_item/1, get_item_name/3, node_to_path/1,
    path_to_node/1, depends/3,
    get_entity_subscriptions_for_send_last/2, get_last_items/3,
    get_only_item/2]).

depends(_Host, _ServerHost, _Opts) ->
    [{mod_caps, hard}].

init(Host, ServerHost, Opts) ->
    node_flat_sql:init(Host, ServerHost, Opts),
    ok.

terminate(Host, ServerHost) ->
    node_flat_sql:terminate(Host, ServerHost),
    ok.

options() ->
    [{sql, true}, {rsm, true} | node_pep:options()].

features() ->
    [<<"rsm">> | node_pep:features()].

create_node_permission(Host, ServerHost, Node, ParentNode, Owner, Access) ->
    node_pep:create_node_permission(Host, ServerHost, Node, ParentNode, Owner, Access).

create_node(Nidx, Owner) ->
    node_flat_sql:create_node(Nidx, Owner),
    {result, {default, broadcast}}.

delete_node(Nodes) ->
    node_flat_sql:delete_node(Nodes).

subscribe_node(Nidx, Sender, Subscriber, AccessModel,
	    SendLast, PresenceSubscription, RosterGroup, Options) ->
    node_flat_sql:subscribe_node(Nidx, Sender, Subscriber, AccessModel, SendLast,
	PresenceSubscription, RosterGroup, Options).


unsubscribe_node(Nidx, Sender, Subscriber, SubId) ->
    case node_flat_sql:unsubscribe_node(Nidx, Sender, Subscriber, SubId) of
	{error, Error} -> {error, Error};
	{result, _} -> {result, []}
    end.

publish_item(Nidx, Publisher, Model, MaxItems, ItemId, Payload, PubOpts) ->
    node_flat_sql:publish_item(Nidx, Publisher, Model, MaxItems, ItemId,
	Payload, PubOpts).

remove_extra_items(Nidx, MaxItems, ItemIds) ->
    node_flat_sql:remove_extra_items(Nidx, MaxItems, ItemIds).

delete_item(Nidx, Publisher, PublishModel, ItemId) ->
    node_flat_sql:delete_item(Nidx, Publisher, PublishModel, ItemId).

purge_node(Nidx, Owner) ->
    node_flat_sql:purge_node(Nidx, Owner).

get_entity_affiliations(_Host, Owner) ->
    OwnerKey = jid:tolower(jid:remove_resource(Owner)),
    node_flat_sql:get_entity_affiliations(OwnerKey, Owner).

get_node_affiliations(Nidx) ->
    node_flat_sql:get_node_affiliations(Nidx).

get_affiliation(Nidx, Owner) ->
    node_flat_sql:get_affiliation(Nidx, Owner).

set_affiliation(Nidx, Owner, Affiliation) ->
    node_flat_sql:set_affiliation(Nidx, Owner, Affiliation).

get_entity_subscriptions(_Host, Owner) ->
    SubKey = jid:tolower(Owner),
    GenKey = jid:remove_resource(SubKey),
    HLike = <<"%@", (node_flat_sql:encode_host_like(element(2, SubKey)))/binary>>,
    GJ = node_flat_sql:encode_jid(GenKey),
    Query = case SubKey of
	      GenKey ->
		GJLike = <<(node_flat_sql:encode_jid_like(GenKey))/binary, "/%">>,
		?SQL("select @(host)s, @(node)s, @(plugin)s, @(i.nodeid)d, @(jid)s, @(subscriptions)s "
		     "from pubsub_state i, pubsub_node n "
		     "where i.nodeid = n.nodeid and "
		     "(jid=%(GJ)s or jid like %(GJLike)s %ESCAPE) and host like %(HLike)s %ESCAPE");
	      _ ->
		SJ = node_flat_sql:encode_jid(SubKey),
		?SQL("select @(host)s, @(node)s, @(plugin)s, @(i.nodeid)d, @(jid)s, @(subscriptions)s "
		     "from pubsub_state i, pubsub_node n "
		     "where i.nodeid = n.nodeid and "
		     "jid in (%(SJ)s,%(GJ)s) and host like %(HLike)s %ESCAPE")
	    end,
    {result,
     case ejabberd_sql:sql_query_t(Query) of
	 {selected, RItems} ->
	     lists:foldl(
	       fun({H, N, T, I, J, S}, Acc) ->
		       O = node_flat_sql:decode_jid(H),
		       Node = nodetree_tree_sql:raw_to_node(O, {N, <<"">>, T, I}),
		       Jid = node_flat_sql:decode_jid(J),
		       lists:foldl(
			 fun({Sub, SubId}, Acc2) ->
			     [{Node, Sub, SubId, Jid} | Acc2]
			 end, Acc, node_flat_sql:decode_subscriptions(S))
	       end, [], RItems);
	 _ ->
	     []
     end}.

get_entity_subscriptions_for_send_last(_Host, Owner) ->
    SubKey = jid:tolower(Owner),
    GenKey = jid:remove_resource(SubKey),
    HLike = <<"%@", (node_flat_sql:encode_host_like(element(2, SubKey)))/binary>>,
    GJ = node_flat_sql:encode_jid(GenKey),
    Query = case SubKey of
	      GenKey ->
		GJLike = <<(node_flat_sql:encode_jid_like(GenKey))/binary, "/%">>,
		?SQL("select @(host)s, @(node)s, @(plugin)s, @(i.nodeid)d, @(jid)s, @(subscriptions)s "
		     "from pubsub_state i, pubsub_node n, pubsub_node_option o "
		     "where i.nodeid = n.nodeid and n.nodeid = o.nodeid and "
		     "name='send_last_published_item' and val='on_sub_and_presence' and "
		     "(jid=%(GJ)s or jid like %(GJLike)s %ESCAPE) and host like %(HLike)s %ESCAPE");
	      _ ->
		SJ = node_flat_sql:encode_jid(SubKey),
		?SQL("select @(host)s, @(node)s, @(plugin)s, @(i.nodeid)d, @(jid)s, @(subscriptions)s "
		     "from pubsub_state i, pubsub_node n, pubsub_node_option o "
		     "where i.nodeid = n.nodeid and n.nodeid = o.nodeid and "
		     "name='send_last_published_item' and val='on_sub_and_presence' and "
		     "jid in (%(SJ)s,%(GJ)s) and host like %(HLike)s %ESCAPE")
	    end,
    {result,
     case ejabberd_sql:sql_query_t(Query) of
	 {selected, RItems} ->
	     lists:foldl(
	       fun ({H, N, T, I, J, S}, Acc) ->
		       O = node_flat_sql:decode_jid(H),
		       Node = nodetree_tree_sql:raw_to_node(O, {N, <<"">>, T, I}),
		       Jid = node_flat_sql:decode_jid(J),
		       lists:foldl(
			 fun ({Sub, SubId}, Acc2) ->
			     [{Node, Sub, SubId, Jid}| Acc2]
			 end, Acc, node_flat_sql:decode_subscriptions(S))
	       end, [], RItems);
	 _ ->
	     []
     end}.

get_node_subscriptions(Nidx) ->
    node_flat_sql:get_node_subscriptions(Nidx).

get_subscriptions(Nidx, Owner) ->
    node_flat_sql:get_subscriptions(Nidx, Owner).

set_subscriptions(Nidx, Owner, Subscription, SubId) ->
    node_flat_sql:set_subscriptions(Nidx, Owner, Subscription, SubId).

get_pending_nodes(Host, Owner) ->
    node_flat_sql:get_pending_nodes(Host, Owner).

get_states(Nidx) ->
    node_flat_sql:get_states(Nidx).

get_state(Nidx, JID) ->
    node_flat_sql:get_state(Nidx, JID).

set_state(State) ->
    node_flat_sql:set_state(State).

get_items(Nidx, From, RSM) ->
    node_flat_sql:get_items(Nidx, From, RSM).

get_items(Nidx, JID, AccessModel, PresenceSubscription, RosterGroup, SubId, RSM) ->
    node_flat_sql:get_items(Nidx, JID, AccessModel,
	PresenceSubscription, RosterGroup, SubId, RSM).

get_last_items(Nidx, JID, Count) ->
    node_flat_sql:get_last_items(Nidx, JID, Count).

get_only_item(Nidx, JID) ->
    node_flat_sql:get_only_item(Nidx, JID).

get_item(Nidx, ItemId) ->
    node_flat_sql:get_item(Nidx, ItemId).

get_item(Nidx, ItemId, JID, AccessModel, PresenceSubscription, RosterGroup, SubId) ->
    node_flat_sql:get_item(Nidx, ItemId, JID, AccessModel,
	PresenceSubscription, RosterGroup, SubId).

set_item(Item) ->
    node_flat_sql:set_item(Item).

get_item_name(Host, Node, Id) ->
    node_flat_sql:get_item_name(Host, Node, Id).

node_to_path(Node) ->
    node_flat_sql:node_to_path(Node).

path_to_node(Path) ->
    node_flat_sql:path_to_node(Path).
